Sash lock



Feb. 10, 1959 A. w. AHLGREN SASH LOCK 2 Sheets-Sheet 1 Filed April 25, 1957 MVEMT Q F 10, 1959 i A. w. AHLREN 2,873,134

' SASH LOCK Filed April 25, 1957 v 2 Sheets-Sheet 2 v m I, I 25 I 38 :11 t 7 III/III, z:

Q 42 V/ Wkf6 A l Gkfqflklrem) SASH LOCK AxelW.,A;hlgren, Rockford, Ill.,, assignor to Amerock Corporation, Rockford, 11]., a corporation of Illinois Application April '25,- 1957, Serial No. 655,046 6 Claims. (Cl. 292-111),

This invention relates to asash lock of the type in which a bolt is pivoted; on, one sash of a window to swing into and out of engagementv with a strike mounted on the other sash to lock and release the sashes. More particularly, the invention has reference to a lock in which the bolt is biased by a spring; toward thereleased position so that the bolt, when it is not intended to lock the window,'does not remain in the projected position.

The principal object of the invention is to provide in a sash lock of the above character a -novel means for overcoming the action of'the'return springautomatically as the bolt engages the strikeso that, under this condition, the bolt is held in the-locked position.

A more detailed object is to utilize a detent which normally is inactive but is rendered operative upon engagement of the bolt with theistrike'andwhich, when operative, holds the bolt in the locking position.

Other objects and, advantages of the invention will become apparent from the following detailed description taken in connection with the accompanying drawings, in which Figure l is a plan view 'of a sash lock embodying the features of the present invention, the parts being shown in the released position.

Fig. 2 is a'view similar to Fig. 1 but shows the parts in a locked position.

Fig. 3 is a plan view of the lock with the partsin the released position, portions being broken away and .shown in section.

Figs. 4 and 5 are views similar to Fig. 3 but showing the parts in moved'positions.

Fig. 6 is a sectional view taken along the line 6-6 of Fig. 2;

Fig. 7 is a sectional view taken along the line 77 in Fig. 6.

Fig. 8 is a sectional view taken along the line 8-8.

in Fig. 6.

Fig. 9 is a perspective view of the spring used to hold'the bolt in the locked position.

Fig. 10 is an enlarged sectional view taken along the line 10-10 in Fig. 7;

Fig. 11 is a fragmentary view similar to Fig. 10 but showing the parts in a moved position.

Fig. 12 is an exploded perspective view of the lock.

As shown in the drawingsfor purposes of illustration, the invention is embodied in a sash lock for locking windows such as the conventional double hung sliding type. The lock includes a,bo1t 15 which is mounted on the top rail 16 of the upper sash through the medium of a base plate 17'and which is swung horizontally into and out of engagement with a strike -18. The latter is in the form of a lug 19 (Fig. 7) upstanding from one edge of a plate 20 which is secured to the bottom rail 21 of the lower sash by screws 22. A flange 23 projects laterallyaway from the bolt at the'top of the lug 19.

The bolt 15 is in the form of an elongated plate having a downwardly turned hook 24 on its outer end 2,873,134 Patented Feb. 10, 1959 'ice to extend over and under the-flange 23; of the strike 18. Longitudinally spaced lugs 25 and 26 projectdownfrom the ,innerend portion of the bolt and intoa generally: circular;reces s 27'- (Fig. 8) in the top of a boss 28 in the, central portion of the base plate 17. As shown in Figs. 8*and 12, a,slot-29-projects, radially outwardly from the; recess .27 on the side opposite the strike; 18 and.a shoulder 30. projects into the recess alongside the slot to form a stop.

With. the lugs. 25 and 26 projecting into the recess 27, the latter servesto guide the bolt 15* in its locking,

and'releasing movements. Thus, in the unlocked posi tion, thelugs occupy the position shownin broken lines in Fig. 8. To move the bolt to .the locked position, it istturned clockwisethrough degrees until-.t-helug 26 engages the stop 30. This bringsthe hook 24. over the flange 23. The belt then is moved radially ofthe recess 27 to slide the lug 26 into the slot 29 and this brings the hook of the bolt tight against the strike 18.

To move the bolt 15 through its turning andslidingmovements, a handle 31 is operatively connected to the-bolt and is mounted on top-ofthe latter to turn about the axis of the recess 27. The handle comprises a circular plate 32 and a finger piece33 project: ing laterally' from the plate. The'plate'is disposed concentricallywith-therecess 27 and a comparatively long pin 34' integral with the plate projects down fromthe" center thereof; through an elongated slot 35 formed in the bolt 15 between the lugs'25 and- 26 and'through a hole 36" (Fig. 12) formed inthe boss 28 at the center of the recess 27. A shorter pin 37 radially spaced from the pin 34 depends from the underside of the plate 32 and; when the lock is in the released position as shown in Figs. 1 and 3, thepin 37 projects into a slot 38 which also-is formed-in the bolt 15 and which extends laterally from-the end of the slot 35 adjacent the lug 26. A flat washer 39 (Fig. 7) which may be made of molded nylon, is disposed between the plate-32 and the bolt to facilitate turning of the-handle 31 and a collar 40 is pressed onto the lower end of the pin 34 to hold the entire-bolt assembly together.

With the foregoing arrangement, the bolt 15 is disposed alongside the strike 18 and projects toward the left as viewed in Fig. 1 when the lock is released and the finger piece 33 extends to the right and away from the strike. which'projects towardthe strike as shown in Fig. 3. To

move the parts to the locked position, the handle-31 is turned clockwise. Because of the pin 37" and slot 38', the boltturns in unison with the handle about the pin 34.

After the handle; 31 has been turned through 90 degrees, the lug 26'abuts against the stop30 and prevents further turning of the bolt15. At this time, the parts are in the position shown in Fig. 4, that is, the bolt extends over the strike 18 and the slot 38 projects to the right-andaway from the strike. Upon continued turning of the handle, the pin 37 and slot 38 produce a camaction which slides the bolt back and tight against the strike, the lug 26 moving back into the slot 29. During this camming action, the pin 37 moves. into the slot 35 as shown in Fig. 5 at which time the parts are in the locked position. When the handle is swung-in the opposite direction, the movements of the parts are reversed and the.

down, the parts of-thelockare biased toward the released position by. a torsion spring 41. The latter is a coil spring encircling the lower end portion of the pin 34 with one end 42 anchored to an ear 43 on the collar 40 and the At thesame time, the pin 37 is in the slot 38 3 other end 44 hooked to the portion of the boss 28 which forms the recess 27 as shown in Fig. 8. The spring urges the handle 31 in a counterclockwise direction as viewed in Fig. l and thus tends to turn the bolt 15 to the un locked position.

According to the present invention, novel means is utilized to overcome the action of the spring 41 when the bolt 15 engages the strike 18 but only under that condition. In general, this means comprises a detent 45 which prevents the bolt from swinging back to the released position and which is normally inactive but is rendered operative by the engagement of the bolt with the strike.

Herein, the detent 45 is a rounded notch in the end of the slot55 adjacent the lug 26 and, when the bolt 15 engages the strike 18, the bolt is slid forward to place the pin 37 in this notch as shown in Fig. 10. With the parts in this position, the spring 41 is ineffective to turn the bolt. Turning of the handle 31 without the bolt engaging the strike merely moves the parts to the position shown in Fig. 11 in which the pin 37 is out of the notch 45 so that the spring 41 can return the bolt when the handle is released. If the bolt engages the strike, however, the strike pulls the bolt forward and the pin enters the notch.

To hold the pin 37 in the notch 45 with sufiicient force to overcome the effect of the spring 41, a second spring 46 is mounted on the strike 18 and acts between the latter and the bolt 15 to urge the bolt forwardly, that is, in the direction to seat the pin in the notch. In the present instance, the spring 46 is a strip of spring material (see Fig. 9) wrapped around the lug portion 19 of the strike with the free end portion 47 engaging the hook 24 and thereby urging the bolt in the proper direction.

It will be seen that, unless the bolt 15 engages the strike 18, the spring 41 will return the bolt to the retracted position. it is swung out to the locking position, the strike slides the bolt forward to locate the pin 37 in the notch 45 and the spring 46 holds the parts in this position so that the bolt is prevented from returning to the released position under the action of the spring 41.

I claim as my invention:

1. A sash lock comprising a base adapted to be mounted on one sash of a window, a strike adapted to be mounted on another sash of the window, an elongated bolt having one end portion overlapping said base and a longitudinal slot in said end portion, a pin projecting through said slot and into said base and mounting said bolt to turn about the axis of the pin toward and away from a projected position in which the bolt engages said strike and to slide longitudinally, a spring acting between said base and said bolt to urge the bolt away from said projected position, a second pin rigid with said first pin and projecting into said slot when said bolt is in the projected position, said bolt sliding forwardly upon engagement with said strike and said slot having a notch receiving said second pin upon such forward sliding to hold the bolt in the projected position against the action of said spring, a second spring formed as a part of said strike and engaging said bolt when the latter is in said projecting position to urge the bolt forwardly and thereby hold said pin in said notch, and means for turning said bolt into and out of said projected position.

2. A sash lock having, in combination, a base adapted to be mounted on one sash of a window, a strike adapted to be mounted on another sash of the window, an elongated bolt pivotally connected at one end to said base to swing toward and away from a projected position in which it engages said strike, said bolt also being supported on said base for limited longitudinal sliding and operable to slide forwardly upon engagement with said strike, a spring acting between said base and said bolt and urging said bolt away from said projected position,

and first and second parts connected respectively to said- When the bolt engages the strike as 4, base and said bolt and operable upon forward sliding of the bolt to engage each other and hold the bolt in said projected position thereby to overcome the action of said spring, said strike including a second spring urging said bolt forward to hold said first and second parts in operative engagement.

3. A sash lock having, in combination, a strike adapted to be mounted on one sash of a window, a base adapted to be mounted on another sash of the Window, a bolt supported by said base to swing into and out of engagement with said strike, a spring acting between said base and said strike and urging the bolt out of engagement with said strike, first and second parts connected respectively to said base and said bolt and operable when brought into active relationship with respect to each other to hold the bolt against turning under the action of said spring, and yieldable means operable when the bolt engages the strike to hold said parts in active relationship.

4. A sash lock comprising a base adapted to be mounted on one sash of a window, a strike adapted to be mounted on another sash of the window, an elongated bolt having one end portion overlapping said base and a longitudinal slot in said end portion, a pin projecting through said slot and into said base and mounting said bolt to turn about the axis of the pin toward and away from a projected position in which the bolt engages said strike and to slide longitudinally, a spring acting between said base and said bolt to urge the bolt away from said projected position, a second pin rigid with said first pin and projecting into said slot when said bolt is in the projected position, said bolt sliding forwardly upon engagement with said strike and said slot having a notch receiving said second pin upon such forward sliding to hold the bolt in the projected position against the action of said spring, and means for turning said bolt into and out of said projected position.

5. A sash lock having, in combination, a base adapted to be mounted on one sash of a window, a strike adapted to be mounted on another sash of the window, an elongated bolt pivotally connected at one end to said base to swing toward and away from a projected position in which it engages said strike, said bolt also being supported on said base for limited longitudinal sliding and operable to slide forwardly upon engagement with said strike, a spring acting between said base and said bolt and urging said bolt away from said projected position, and first and second parts connected respectively to said base and said bolt and operable upon forward sliding of the bolt to engage each other and hold the bolt in said projected position thereby to overcome the action of said spring.

6. A sash lock having, in combination, a strike adapted to be mounted on one sash of a window, a base adapted to be mounted on another sash of the window, a bolt supported by said base to swing into and out of engagement with said strike, a spring acting between said base and said strike and urging the bolt out of engagement with said strike, first and second parts connected respectively to said base and said bolt and operable when brought into active relationship with respect to each other to hold the bolt against turning under the action of said spring, and means operable automatically as an incident to the bolt engaging the strike to bring said parts into active relationship.

References Cited in the file of this patent UNITED STATES PATENTS 567,620 Smith Sept. 15, 1896 629,613 Roscnkranz July 25, 1899 1,677,825 Hilty July 17, 1928 2,012,341 Eras H Aug. 27, 1935 2,151.2l9 Madsen Mar. 21, 1939 

